Grinder and shredder



H. J. SHELTON'.

GRINDER AND SHREDDER.

APPLICATION FILED MAY 12, 1920- RENEWED APR. 24, 1922.

I Lggjhjgl u Patented July 4, 19220 fig- 1- WITNESS: INVENTOR.

HARRY LI- SHELTON,

HIS AT ORNEY.

@FFH@E.

GRINDER AND SHREDDER.

Specification of Letters Patent.

Patented July 4, i922.

Application filed May 12, 1920, Serial No. 380,894. Renewed April 24, 1922. Serial No. 556,360.

To all whom it may concern:

Be it known that I. HARRY J. SHELTON,

residing in the city of St. Louis, in the State of Missouri, have invented a new and useful Improvement in Grinders and Shredders, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, which form a part thereof. I

My invention relates particularly to grinders and shredders used for grinding rather light material and material which is fairly free flowing, and in which the material to be ground is, to a certain extent, drawn into the machine by a current of air induced by a suction fan of the centrifugal blower type, and in which the same fan draws the ground material from the housing of the machine and blows it to the place where it is to be used or stored. In such material there is usually found a greater or less quantity of foreign substances, such as nails and pebbles, and it is desirable to prevent these foreign substances from entering the grinder so as to prevent them from coming in contact with and injure the screening plate.

The object of my invention. is to provide a separator whereby foreign substances, such as nails and pebbles, will be separated from the material to be ground before said material is admitted to the grinder.

My invention is fully shown in the accompanying drawings where similar letters are used to designate similar parts. Fig. 1 shows a front view of a grinder equipped with a separator embodying my invention;

Fig. 2 shows a section on the line 2-2 of Fig. 1.

Referring to the figures, A representsa grinder which has the ordinary mechanism for grinding contained in the housing and which is driven by a,belt, not shown, which engages with the pulley A. B is a suction fan, preferably of the centrifugal blower type, which is driven by the same shaft as the grinder and which is connected tothe underside of the housing of the grinder A by means of the pipe C. The grinder and fan are usually placed on the skids R so as to allow the pipe C to be run. beneath them.

D is the outlet or discharge pipe from the fan through which the ground material is blown to where it is to be used or stored.

E is the inlet through which the material passes into the grinder, and F is the casing of a separator which is placed over the inlet E and which has at its upper end a flanged opening G which may be connected by a suitable means to the source of supply of the material to be ground. H is a swinging deflector pivotally mounted on the point I inside of the separator near the mouth G thereof, and which has at its lower end an arcuate lip J curved outwardly as indicated so as to tend to throw objects which strikes it outwardly from the rear wall I) of the casing of the separator on which the damper is pivoted toward the front wall a. K is a thumb screw which engages with the nut L fastened on the rear wall 6 of the separator and which is pivotally connected at the point M to the rear side of the deflector H. By turning the thumb screw K the position .of the separator are preferably placed below the inlet opening E.

The operation of the separator is as follows: When the separator and fan are in motion and material is being fed to the machine through the opening G, the fan draws air into the grinder with the material. The material to be ground strikes the deflector H and is deflected thereby and the curved toe J of the damper tends to throw the material towards the front wall a of the separator. The air drawn through the opening G with the material to be ground passes around the end of the deflector H into the grinder opening E and it carries with it the light material, which is the material to be ground, while the foreign substances, such as nails and pebbles, because of their weight, are thrown forwardly by the toe J towards the front wall of the separator and 'fall into the pocket P. Sometimes it is necessary in order to prevent material that is to be ground fro-m accumulating in the pocket P to partly open the openings 0 by raising the doors 0. And sometimes it becomes desirable to partly open the peni g N.

of the deflector H with respect to the front Opening these openings allows air to pass into the separator therethrough and this air tends to deflect the material which is to be ground and thus prevent it from accumulating in the pocket P. The position of the deflector H will, for most materials, be about asshown in Fig. 2, but if it be found that a given position is not such as togive the best results, the position may be adjusted by means of the thumb screw K until the damper is placed in a suitable, position inside of the separator. Any foreign material which may be drawn intothe pocket P may be removed therefrom throughthe openings 0. The proportions of the casing of the separator may be varied to suit the requirements of different grinders and of different materials to be ground withoutdeparting from the spirit of my invention. a

What I claim as new and desire tovsecure by Letters Patent, is:

1. A suction fan in CO1 ibination with a grinding and shredding machine having an inlet opening upwardly, a separator mounted on said inlet comprising a casing having vertical rear and side walls, the lower end of said rear wall and the parts of the lower end of said walls adjacent thereto resting on. .the upper edges of said inlet and saidside w alls extending downwardly in front of and below said inlet to form a pocket, a front wall following the contour of the front edges of said side walls, and an adjustable deflector pivotally -attached to said rear wall near the upper end thereof and extending downwardly toward and terminating above said inlet. a

2. A suction fan in combination with a grinding and shredding machine, a grinding chamber in said machine, a separator mounted on the inlet of said chamber comprising a casing, a pocket in said casing below and in front of the inlet of said grinding chamber, the walls of said pocket having one or more openings whereby air may be admitted into said pocket, doors whereby the flow of air through said openings may be controlled, an adjustable deflector pivotally attached near the upper end of the wall of said separator opposite said pocket and having its lower end bent outwardly in an arc and terminating above the inlet of said grinding chamber whereby foreign objects in the material to be ground or shredded are projected out of the pathof said material and into said pocket, and means whereby said deflector is held in adjusted position.

In witness whereof I have signed my name to this specification. HARRY SHELTON. 

